5 Answers
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An "Apple" drive is just a drive from another brand, with an Apple sticker stuck over the top. So as far as reliability goes, just choose one from a recognised manufacturer (Western Digital, Seagate, Maxtor, etc) and you won't have any issues.

Personally I'm using WD Green drives.

The only thing to be wary of is that some controllers (I don't know about apple in this case, but it wouldn't surprise me given their history) will refuse to work with off-brand drives. I had a RAID controller from an old dell that would not work with anything except Dell drives, even when the other drives were identical, just with a different part number (same manufacturer, but non-dell branded).

Thanks for the response. As you suggest, I have seen reports that the RAID Apple card does not work well with Samsung F1's. Do the green's actually work with Apple's card then?
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teabotJul 22 '09 at 12:08

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I'm afraid I don't know for sure, as I'm running them on a Dell card, but if they "Don't work well" that that usually means that in some capacity that they do work, which means you're probably safe. If you buy just one drive from a chain store you can probably safely return it if it doesn't work. If it does work, go to your local discount store and buy the rest?
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Mark HendersonJul 22 '09 at 21:11

We thought it was ridiculous to pay what Apple was asking for drives. We got bit, though, with a batch of hard drives that had a firmware flaw (and many other people, with and without RAID sets, lost data due to it.) We have since learned that Apple does make sure that Apple-branded drives have firmware on them that will work with their controller. I'd have to say that the extra money is for peace of mind. In the future, we will consider third-party RAID drives, as they offer more advanced features that may have facilitated recovery.
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Clinton BlackmoreJul 6 '10 at 15:38

Alexander, search the various forums for people using the Mega RAID cards supplied by Apple for their XServe G5s. I believe people were still reporting issues even with the RAID card for the early 2006/2007 MacPros as well. Some people can get them to work and others cannot. We had them working for a while and then the RAID settings kept disappearing from the RAID card. We tried other Mega RAID cards, motherboards, and hard drives, etc. We found only the Apple branded drives would work correctly all the time. We even used identical drives minus the Apple branding and those drives did not work. Only difference was the Apple firmware on a drive. Up until that time we would install non-Apple drives on Apple RAID cards. Now we need to do extensive testing and research before doing so anymore.

It seems the 2008 MacPro Apple RAID card may work fine with non-Apple drives. We've been running a machine with them for a few months without seeing problems yet.

Always check the manufacturer's recommendations and always search forums to see if anyone is having issues with a particular configuration is not covered by the manufacturer's recommendations. Then make sure you perform your own testing before relying on it for a critical system. Just because it unofficially worked in the past does not mean it will work on newer hardware.

Even though Apple uses major brand drives in their systems, they may contain custom Apple firmware. I personally would not use non-Apple drives on any Apple hardware raid. You don't want to risk an intermittent issue cropping up because of a firmware incompatiblity. I've seen some Apple hardware RAID cards work with non-Apple drives and then suddenly have intermittent failures after a bit of use. If you want to use non-Apple drives, then invest in a third party RAID card that does support standard drives.

While many hardware RAID vendors do limit compatibility with some drives, I feel it is wrong of Apple to limit it to only their outrageously expensive ones.

Be aware that most drives with a capacity > 1TB are so called desktop drives. This means they are specified for 8h/5d/week usage. You may even loose warranty if your drive usage goes beyond that.
Since today it is very unlikely that your computer is running "only" 8h a day, for no more than 5 days a week, I recommend going for server grade drives. Yes, they are a little more pricey. (Like the ES series from Seagate.)

If you compare the failure rates of server and desktop drives you need to calculate in the different usage schemes to compare correctly. (Desktop 8h/5d/w, Server: 24/7/365) Server grade drives have substantially less failure rates.

Of course you should have current backups of your data at all times! (If it is not destroyed by the fire, then the extinguishing water will.)

If you intend to run your drives a RAID 5 you may want to get server grade drives with special RAID firmware. This is different in timing responses to the controller and will get you better reliability as well as performance.

I've been using the Apple Raid Card (first release version) since 2008. Used it very successfully with Hitachi Ultrastar A7K100 750GB drives (3 SATA drives in a RAID 5 configuration) and 1 Seagate Cheetah 15K.6 300GB SAS drive. Put the OS on the SAS drive and data files (digitized feature film video) on the RAID. Except for one failed battery (requiring the card to be replaced under warranty), really no problems with it. This is even though Apple says the card needs all SAS or all SATA drives.

However, about 5 months ago I upgraded from the 750GB drives to 2TB Hitachi 7K3000 Deskstar drives, which have flaked out, at a rate of about once every 2 months. The RAID card simply loses contact with a drive, declares it missing, kicks it out of the RAID array, and then almost immediately reconnects to it, but because it has been kicked out, it is treated as a new drive and has to be reassigned to the array, forcing a complete rebuild. Which, now that the array is made up of 2TB drives, takes about 36 hours. Kind of scary because the flakes seem random, and if one of the "good" drives fails during the rebuild, the whole array is lost. And at 3TB, I don't have full backups for the array. I've also been feeling like there are performance issues with these 2TB drives that I didn't have before, but I can't be sure.

I'm seriously considering upgrading to the SAS Ultrastar version of the drives (Hitachi Ultrastar 7K3000 HUS723020ALS640 2 TB). Just I need to buy 4 to have a spare on hand, and they're currently close to $300 each.

BTW, the reason I'm getting 2TB drives instead of bigger ones as there are serious questions about whether or not the card can handle bigger drives.

Also, while I've never bought an Apple Drive except for the ones that came with the machine (and have found those to wear out sooner than the Hitachi drives), Apple does include custom firmware on their drives and I do believe that makes a difference with the RAID card. Personally I would not attempt to use the card with drives other than from Apple, Hitachi, or Seagate. For sure I would not try using "green" drives that slow down their spindle speed to conserve power. That's asking for performance nightmares.